For which of the following species `e/m` value is highest?
(A) `D^(+)`
(B) `H^(+)`
(C) `D_(2)^(+)`
(D)`H_(2)^(+)`

Which of the following species has tetrahedral geometry? A BH_(4)^(-) B NH_(2)^(-) C CO_(3)^(2-) D H_(3)O^(+)

Which of the following are green house gases ? (a) CO_2 (b) O_2 (c) O_3 (d) CFC (e) H_2O

Classify the following into electrophilies and nucleophiles: (a) H^(+) , (b) NH_(3) (c) AlCl_(3) , (d) NO_(2)^(+) (e) CN^(-) , (f) H_(2)O (g) ROH , (h) H_(2)O (i) Carbocation.

Which of the following has larger bond angle in the following pairs ? (a)NH_(3),PH_(3)(b)BeF_(2),BF_(3)(c )H_(2)O,CO_(2)(d)H_(2)O,H_(2)S(e)C CL_(4),C_(2)H_(2) ?

Identify unknown compounds A to E in the following series of chemical reactions. (i) (ii) A+B overset("dil NaOH")to C+ H_(2)O (iii) C overset((i) O_(3)) underset((ii) Zn//H_(2)O) to A+D (iv) D overset(H_(2)//Ni)underset(Delta) to E

In Figure, the value of x for which D E || A B (a) 4 (b) 1 (c) 3 (d) 2

Give the characteristic tests for the following gases. (a) CO_(2)" "(b) SO_(2) (c) O_(2)" "(d) H_(2)

The species having bond order same as that of (a) CO (b) O_2 (c) N_2 (d) H_2

If A B C and DEF are two triangles such that A B C\ ~= F D E\ a n d\ A B=5c m ,\ /_B=40^0\ a n d\ /_A=80^0dot Then, which of the following is true? (a)D F=5c m ,\ /_F=60^0 (b) D E=5c m ,\ /_E=60^0 (c)D F=5\ c m ,\ /_E=60^0 (d) D E=5c m ,\ /_D=40^0

Which of the following organic compounds will undergo addition reactions? (a) C_2H_6 (b) C_2H_2 (c) C_3H_8 (d) C_3H_6